Shaving device



Feb. l, 1938.

Filed June 24, 1937 @1M @fw-f A11' i i IZ I i ,sq

l gf l 3f' M! nl nl 10 ,UIN I'Il if j4` 15 a 15 Z 8 15 15`n Z4 15 1Q A56 20 512% if, .223g- 32 32 ai# 551' a@ Patented Feb. l, 193

or-via SVING DEVICE Application June 24, 1937, Serial No. 150,015 e c (ci. :id-4c) The invention relates to improvements in shaving machines of the type which are operated by power, such as an electric motor mounted in the handle thereof. A device of such general character is disclosed, for example, in the patent to Connolly 2,078,563.

In the construction of this Connolly patent und in other similar constructions it has been common to provide compressed spring means for urging the inner movable cutter into engagement with the outer stationary member. Also in many of these constructions the shaving head, including both the movable cutter and the normally stationary cutter member, has been made removable as a unit. The provision of these two desirable features, however, has introduced problems of properly relating the same and of obtaining a device of simple form, economical to make, and convenient to clean and to assemble or disassemble. Thepresent invention is concerned particularly with these factors.

The more general features of the invention as incorporated in shaving devices of the vtype described comprise a head having an outer stationary cutter and an inner movable cutter urged into contact with the outer cutter by a spring and plunger means, this means being contained in the head and the Whole being removable as a unit from the supporting handle and drive means. When thus removed, however, the spring pressure means becomes ineffective, permitting the inner cutter member to slip out freely from the head and rendering immediately the parts accessible for such purposes asv examination, cleaning and lubricating. Correspondingly, in reassembling, the inner cutter may be slid easily and conveniently into place.

T he construction' as a whole is very simple and economical of manufacture, such detail machining, fitting and assembling as is necessary being performed for the most part in the readily accessible elements of the removable head, as distinguished, for example, from the more diiiicult and expensive task of introducing these into the handle, and at the same time ensuring that the' spring pressure means will function properly.

The parts are so made and arranged as to be movable in a uniform manner, free from binding or undue friction, and practically impossible of getting out of order.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the features of construction, combination of elements,

and arrangement of parts, which will be exemplied in the construction hereinafter set forth and the scope of which invention will be indicated in the claims.

For a. fuller understanding of the nature and 5 objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is a general. view in elevation of a razor 10 adapted to be driven by electric motor and. having the features of this invention incorporated therein;

Fig. 2 is a vertical sectional view through the elements of the operating head; 15

Fig. 3 is a view somewhat similar to Fig. 2, but with the parts shown in the position when the head is completely removed from the handie; and

Fig. 4 is a transverse sectional view taken on 20 the line Ii-i of Fig. 3.

A razor of the general type in which this invention is adapted to be incorporated is shown in Fig. 1, and comprises a handle i@ adapted to contain an electric motor or other suitable power 25 source arranged to reciprocate the movable cutter element by a suitable drive connection, such as by oscillation of the lever li about the pivot I2 fixed in the handle. The cutter head assembly is indicated generally at i3. The cutter head 30 may vary in its general shape and the nature of the cutting members, but 'as here shown it is generally similar in construction to that shown in the above noted Patent No. 2,078,563 and comprises an outer stationary cutter member I4 and an inner movable cutter member l5 adapted in the present form to receive a reciprocatory motion. The movable cutter l5 is a substantially solid member having recesses i5a in each side surface thereof for the ready egress of cut hairs. 40 The shape of the blade members may vary, the particular type selected here forillustration being similar to those shown in the said prior patent, and comprise, in the outer stationary cutter member, finely spaced teeth i6 having at the 45 central part thereof a raised comb portion I1. Transverse slits are cut in the inner movable cutter l5 to form teeth corresponding to those of the outer cutter. In addition the inner cutter 50 has a groove it extending along the middle of the top surface to form a depression complemental to the raised portion I1 of the outer cutter member. It will be understood that, in the interest of clarlty,`some of the nner dimensions, u

such as the size of the teeth, are exaggerated as to size in the illustration.

'I'he fixed cutter member includes a body portion I9 which may be made integral with the remaining parts, including the teeth of the stationary cutter, but for the purpose particularly of convenience of manufacture, this body portion as shown` is made separately. The remaining outer portion of the stationary cutter comprises a thin plate 20 which may be secured to the body portion I9 by suitable means, such as by brazing. The stationary cutter member includes also a plate 2l adapted to bev secured to the body portion I9 by anysuitable means, such as the screws 22.

The inner movable cutter includes a base portion 24 provided with a notch 25 adapted to receive the ball portion 26 of the oscillatory lever II for reciprocation of the movable cutter. The base portion I9 and plate 2I of the fixed cutter have a central opening 21 providing a clearance for this purpose. As shown in Fig. 4 the base portion 24 of the movable cutteris of increased width over the portion carrying the cutter teeth, and the same is true as to the outer stationary cutter member. In order to ensure close shearing engagement between the blades of the outer and inner cutter with such a shape, a slight clearance will be provided at the points 28.

In accordance with the lprinciples of this invention, there is provided a spring pressure means for maintaining such close engagement between the fixed and movable cutter blades, which means is incorporated completely in the cutter head and are removable therewith as a unit, this spring pressure` means being effective, however, only when the unitary head has been attached to the handle. lThe details of this feature as specifically embodied in the present razor construction comprise vertical holes 30 in the body portion I9 of the stationary cutter adapted to receive therein the balls 3|, which balls are urged into contact with the base 24 of the movable cutter by suitable spring means which may be of various types, such as a flat or curved leaf spring, but as here shown comprising a coil compression spring 32 'for each of the balls 3|. At their lower ends these compression springs engage plungers 33 slidably mounted in apertures in the plate 2l. This plate 2I is counterbored from the side adjacent the body portion I9 to a. size corresponding to the spring openings in the body portion, and the plungers 33 have a flanged head 34 adapted 'to fit into the counterbore. It will be apparent that when the plungers are inserted from the upper surface of the plate 2l and the plate 2l 'then secured to the body portion I9, the plungers are prevented 'from falling out of the assembled head; but provide the projecting portions 33 adaptedto en- .gage the bottom surface 36 of `the supporting handle when the head is assembled therein. The balls 3I are likewise prevented from escaping from the holes 30 when the cutter member 24 is removed from the head, such means comprising a beveled flange portion 36 projecting into the opening 30. 'Ihis flange portion 38 may be conveniently and economically produced in the operation of drilling the hole 30 by drilling the opening from the lower surface of the member I9 and stopping short before the hole is completely drilled through.

As will be observed from Fig. 3, for example,

when the cutter head I3 is removed from the handle the tension on the springs 32 is completely released and the inner cutter 24 is entirely free and is capable normally of sliding out of 'the head of its own weight when the head is turned to asuitable position. When, however, the head is assembled on a handle the plungers 33 will be elevated placing a compression on the springs 32 and causing the balls 3| to bear against the bottom of the base 24 of the movable cutter. A uniform pressure is thereby maintained on the movable cutter member during operation practically free from friction. Any suitable means may be provided for securing the head in the handle, as, for example, the thumb screw'3`I threaded in the handle and adapted to project into a depression 38 in the side of the stationary cutter member.

All of the machining operations and assembling of the spring pressure means for maintaining the cutter members in shearing engagement are confined to the parts of the removable head; Accordingly. and as will be apparent from the construction shown, these operations may be conveniently and economically made. Al-

though the pressure means is a unitary part of the head, it is released and becomes ineffective automatically upon removal of the head from the handle.

Since certain changes may be made in the above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall beinterpreted as illustrative and not in a limiting sense. 1

Having `described my invention, what I claim astnew and desire to secure by Letters Paten is:

1. A unitary head for a power driven shaving device adapted to be mounted on a suitable supporting handle, comprising an outer cutter, an inner cutter movable relative thereto, spring pressed means adapted to urge said inner cutter into shearing engagement with said outer cutter, and a plunger engageable with said spring means and adapted when the head is assembled on the handle to compress said spring means, but freeing said spring means of compression when the head is removed from the handle.

2. In a shaving device a supporting handle, and a shaving head adapted to be removably mounted on said handle, said head comprising an outer stationary cutter member, an inner "movable cutter member and impositive means for urging said inner cuttermember outwardly against said outer cutter member comprising a bearing member supported by the outer cutter member and adapted to engage against a portion of said inner cutter member, spring means for urging said bearing member against said porto relieve the spring and bearing member of pres-- sure.

3. A shaving device4 having a supporting handle, a shaving head, and means for removably mounting said head on said handle, said head comprising an outer cutter member, an inner cutter member movably mounted relative thereto, and spring pressed means for urging said inner member into shearing engagement with said outer member, said means being mounted wholly in said removable head and having a portion engageable with a part of the handle when the head is mounted on the handle to compress said spring means and render it effective to urge said inner member into engagement with said outer member, but releasable to relieve the pressure when the head is removed from the handle.

4. A head for a power -driven shaving device adapted to be mounted on a suitable supporting handle, comprising an outer cutter, an inner cutter movable relative thereto, a pair of .spaced spring pressed means adapted to urge said inner cutter into shearing engagement with said outer cutter, and a plunger for each of said spring means engageable with the respective spring means and adapted when the head is assembled on the handle to compress said spring means, but

freeing said spring means of compression when the head is removed from the handle.

5. A power shaving device combining a supporting handle, and a shaving head removably mounted thereon and having a stationary cutting member, a second cutting member movably mounted relative thereto and having spring pressed means mounted in said head for urging said members together in shearing relation, said means including a part engageable with a portion of said handle to effect compression of the spring means when the head is assembled on the handle.

6. A shaving device combining a supporting handle, and a shaving head removably mounted thereon comprising a stationary cutting member, a second cutting member movably mounted relative thereto and a pair of spaced spring pressed means mounted in said head for urging said members together into close shearing engagement, said means including a part engageable with a portion of said handle to effect compression of the spring means when the head is assembled on the handle.

7. A power shaving device combining a supporting handle, a shaving head and means for remov ably securing said head on said handle, said head having a rst normally xed cutter member, a second cutter movably mounted relative thereto, and means for urging said members into close cutting engagement, comprising a bearing member mounted in said rst cutter member and adapted to bear against said second cutter mem ber, a spring mounted in said first member engageable with said bearing member, and a. plunger mounted in said rst cutter member engageable with said spring and having a part engageable with a portion of the handle when the head is secured thereon to compress thereby said spring.

8. A shaving head for power shavers adapted to be mounted on a supporting handle, said head comprising an outer cutter member, an inner cutter member movable relative thereto, spring pressed means mounted in said outer cutter member for urging said inner cutter memberinto shearing engagement with said outer cutter member, a plate secured to said outer cutter member, a plunger adapted to engage said spring and extending outwardly through an opening in said plate, the outer end of said plunger being engageable with a portion ofthe handle when the head is mounted thereon to compress said spring means and thereby to press said inner cutter member against the outer, but releasable by removal of the head to free the cutter members of such pressure.

JENS O. JENSEN. 

